Compression Question

95blackbeauty · April 29th, 2008, 01:39 PM

ok...Im looking at getting a st of gt40p's this weekend...the thing is they are milled .060 I was wondering what the compression bump would be...and if i would still be alright running the juice with the upped compression.

R0B0T · April 29th, 2008, 03:52 PM

i offer no help with the juice, but it probably bumped your compression up to 10.5:1 if you dont have high compression pistons.

i think for every .03 its milled, it ads .05

fogged306 · April 29th, 2008, 05:12 PM

It doesn't matter what compression ratio you have for nitrous. As long as you have enough fuel and pull a little timing, you will be fine.

JBIGBOOTSY · April 29th, 2008, 05:28 PM

.060 mill will give you 2 really big paperweights.

FoxHoss · April 29th, 2008, 05:42 PM

Originally Posted by JBIGBOOTSY

.060 mill will give you 2 really big paperweights.

haha that sucksss

95opal · April 29th, 2008, 06:51 PM

Originally Posted by fogged306

It doesn't matter what compression ratio you have for nitrous. As long as you have enough fuel and pull a little timing, you will be fine.

+1 Nitrous isnt affected like boost when it comes to compression.
Just make sure your tune is on and you will have no problems.

jam77 · April 29th, 2008, 06:59 PM

I don't think you will be near 10-1 with the heads milled like that. Just be careful because when they mill a ton off the heads sometimes the intake wont fit properly.

95blackbeauty · April 29th, 2008, 09:59 PM

heh. guess i wont be purchasing them...One more question...What head gaskets do i use with the p's?

nba1341 · April 29th, 2008, 10:04 PM

does this mean he has to run 93 octane?

JBIGBOOTSY · April 29th, 2008, 10:04 PM

Originally Posted by 95blackbeauty

heh. guess i wont be purchasing them...One more question...What head gaskets do i use with the p's?

Don't buy them. You'll run into all kinds of problems. P heads use the same gaskets as every windsor headed windsor motor.

JBIGBOOTSY · April 29th, 2008, 10:05 PM

Originally Posted by jam77

I don't think you will be near 10-1 with the heads milled like that. Just be careful because when they mill a ton off the heads sometimes the intake wont fit properly.

p heads are 59cc, .030 mill and a .039 head gasket will give you 10:1.

95blackbeauty · April 29th, 2008, 10:12 PM

So just regular 5.0 head gaskets then.

86gtconvert · May 5th, 2008, 12:11 AM

60 over wont he need the intake to be angle milled

95blackbeauty · May 5th, 2008, 12:15 AM

went a diff route

Drick · May 5th, 2008, 12:49 AM

Originally Posted by JBIGBOOTSY

.060 mill will give you 2 really big paperweights.

Man I love this guy

Reps Jbig

Where you been go in the clubhouse I miss you

JBIGBOOTSY · May 5th, 2008, 05:38 AM

Originally Posted by 8t6gt

Man I love this guy Reps Jbig

Where you been go in the clubhouse I miss you

I just got my pc back from the geek squad people, who had to send it out to HP. Then my new job has me tired as hell. I'll be on alot more now tho.

tom2000r · May 5th, 2008, 07:35 AM

my 540 motor is 13to1 compression,I use 200 hp. nitrous.. with o-ring block and copper head gaskets... head studs

April 29th, 2008, 01:39 PM	#1
95blackbeauty Enthusiast 95 5.0 too slow Join Date: Mar 2007 Location: Athens, TX Posts: 910 iTrader: 0 reviews	Compression Question ok...Im looking at getting a st of gt40p's this weekend...the thing is they are milled .060 I was wondering what the compression bump would be...and if i would still be alright running the juice with the upped compression. __________________ 95 gt H.O. Udp's, Pypes O/r X, flowmaster 40's,CAI, 3.73 gears, C&L 76mm MAF,GT40p's, Shorties, 1.6 rr's,Gt40 manifold, short throw, Back Seat Delete BOOSTED

April 29th, 2008, 03:52 PM	#2
R0B0T Banned 12.8@103... stock motor 11.8@113...150 shot Join Date: Apr 2008 Posts: 464 iTrader: 0 reviews	i offer no help with the juice, but it probably bumped your compression up to 10.5:1 if you dont have high compression pistons. i think for every .03 its milled, it ads .05 Last edited by R0B0T; April 29th, 2008 at 03:54 PM.

April 29th, 2008, 06:59 PM	#7
jam77 Enthusiast 1987 Mustang GT Join Date: Apr 2007 Location: IL Posts: 685 iTrader: 0 reviews	I don't think you will be near 10-1 with the heads milled like that. Just be careful because when they mill a ton off the heads sometimes the intake wont fit properly. __________________ 87 GT, typhoon upper and lower,70mm tb, 90mm maf, bbk shorties, bbk x-pipe, flowmaster cat back, 3:73 gear, pro 5.0 shifter, novi blower,afm power pipe, load IO, Trick Flow heads, Anderson B-31 cam, Anderson PMS, 42 lb injectors, t-rex fuel pump.

April 29th, 2008, 09:59 PM	#8
95blackbeauty Enthusiast 95 5.0 too slow Join Date: Mar 2007 Location: Athens, TX Posts: 910 iTrader: 0 reviews	heh. guess i wont be purchasing them...One more question...What head gaskets do i use with the p's? __________________ 95 gt H.O. Udp's, Pypes O/r X, flowmaster 40's,CAI, 3.73 gears, C&L 76mm MAF,GT40p's, Shorties, 1.6 rr's,Gt40 manifold, short throw, Back Seat Delete BOOSTED

April 29th, 2008, 10:04 PM	#9
nba1341 Banned 1965 Mustang Fastback Join Date: Apr 2007 Location: Los Angeles, Cal Posts: 24,982 Posts: 2,194 iTrader: 0 reviews	does this mean he has to run 93 octane? __________________ I'm a good boy now. [COLOR=red][B]slow car club - crew member 7 of 9 [COLOR=White]Mood: Cool :cool: [/COLOR][/B] [/COLOR]

April 29th, 2008, 05:12 PM	#3
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	It doesn't matter what compression ratio you have for nitrous. As long as you have enough fuel and pull a little timing, you will be fine.

April 29th, 2008, 05:28 PM	#4
JBIGBOOTSY MM Fanatic 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 4,391 iTrader: 0 reviews	.060 mill will give you 2 really big paperweights.

April 29th, 2008, 10:12 PM	#12
95blackbeauty Enthusiast 95 5.0 too slow Join Date: Mar 2007 Location: Athens, TX Posts: 910 iTrader: 0 reviews	So just regular 5.0 head gaskets then. __________________ 95 gt H.O. Udp's, Pypes O/r X, flowmaster 40's,CAI, 3.73 gears, C&L 76mm MAF,GT40p's, Shorties, 1.6 rr's,Gt40 manifold, short throw, Back Seat Delete BOOSTED

May 5th, 2008, 12:11 AM	#13
86gtconvert Regular 1986 mustang gt convert Join Date: Apr 2008 Location: wyoming Posts: 72 iTrader: 0 reviews	60 over wont he need the intake to be angle milled

May 5th, 2008, 12:15 AM	#14
95blackbeauty Enthusiast 95 5.0 too slow Join Date: Mar 2007 Location: Athens, TX Posts: 910 iTrader: 0 reviews	went a diff route __________________ 95 gt H.O. Udp's, Pypes O/r X, flowmaster 40's,CAI, 3.73 gears, C&L 76mm MAF,GT40p's, Shorties, 1.6 rr's,Gt40 manifold, short throw, Back Seat Delete BOOSTED

May 5th, 2008, 07:35 AM	#17
tom2000r Enthusiast Join Date: Jan 2008 Location: ohio Posts: 753 iTrader: 0 reviews	my 540 motor is 13to1 compression,I use 200 hp. nitrous.. with o-ring block and copper head gaskets... head studs

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